Sessions was a foreign policy adviser to Trump and major campaign supporter at the time.

Sessions initially failed to disclose his contacts with Kislyak during his Senate confirmation hearing past year and later said that the meetings were not about the Trump campaign. In Sessions' case, the reports are based only on Kislyak's accounts of what was said.

The report contradicts several public statements made by Sessions saying he never discussed the Trump campaign with Russian Federation and only met with the ambassador in his role as a senator.

According to the Post, Kislyak told his superiors in Russian Federation that he discussed the presidential campaign and issues of importance to his country with Sessions.

The three men are the closest associates of the president to be called to speak to lawmakers involved in probing Russian meddling in the 2016 United States presidential election and possible collusion with the Trump campaign. He also did not mention it when he was asked about contact with Russians during his Senate confirmation hearings earlier this year.

Kushner was among the participants at a June 2016 Trump Tower meeting with a Russian-American lawyer.

Veselnitskaya has denied having had anything to do with the Kremlin and said this week she was ready to testify before US Congress to dispel what she called "mass hysteria" about the meeting with Trump Jr. last June.

In a joint statement, Sens. But because both are cooperating, the panel leaders said in a statement they would not issue subpoenas requiring their presence at a hearing Wednesday, only "reserve the right to do so in the future". President Trump told the New York Times that he talked "about adoption" with Putin during a dinner at the Group of 20 meeting of world leaders in Hamburg this month. Trump Jr. was told the lawyer had damaging information that could be used against Democrat Hillary Clinton.

The President has been disturbed by the disclosure that Mr Mueller could access his personal tax returns without even requesting them from him, according to the Washington Post, since the Internal Revenue Service could provide those documents.

This comes as Mueller's probe into Russia's election meddling appears likely to include some of the Trump family's business ties.

Trump has reportedly been asking his lawyers about his ability to pardon family members, aides, and himself should investigations turn up anything incriminating.